According to study on the ore-controlling geological condition, geological characteristics and spatial distribution of typical gold deposit in western Qinling ore belt.Utilizing the DPIS, the metallogenetic prediction on western Qinling ore belt is carried out and the prospecting areas are plotted and discussed.The predicted results are instructional significance for gold prospecting in western Qinling area.
Muping-Rushan gold belt is located in the eastern Jiaodong granite-greenstone terrain,which is in the eastern margin of North China craton.Jingshan and Jiaodong group metamorphic greenstone is the source bed of gold mineralization.Jinniushan gold deposit is located in north of Muping-Rushan gold ore belt.The main ore-controlling structures are NNE and NE trending faults.Through system studies on in tegrated information of deposit geology, tectonic-geochemistry and geophysics,after engineering verification,forecasting new rospecting target achieve remarkable effect.
Shuijingtun gold deposit is located in the central axis of the Zhangjiakou-Xuanhua mantle branch and in the west of alkaline hornblende monzonite in the area of Shuiquangou-Dananshan in Zhangjiakou. Gold mineralization appears in the middle of ductile shear zone in Shangyi-Chicheng. Gold-bearing minerals are mainly the natural gold and electrum,which are attached to clay minerals or with in crevices of quartz,pyrite and galena as w ell as in between grains of cements,disseminating as vein let or in disseminated and granular shape.Wall rock alteration are the silici-fied,pyritized and sericitized.This paper holds that the metallogenic material of Shuijingtun gold deposit are mainly from core-mantle in depth,based on the research of the elements correlation coefficient as well as the characteristics of some isotopes,such as sulfur,lead,hydrogen and oxygen,etc.
Through a comprehensive analysis for geological features and geochemistry features of albite breccia of
Shuangwang gold deposit,we consider that the albite breccia is a sort of hidden exploding breccia,and the albite slate associated is formed by hydrothermal metasomatic,sodic might be derived from neoproerozoic basement Yaolinghe group of sodium-rich metamorphic volcanic rocks.The fluids of forming albitite is a magmatic fluids riched in sodium and volatile,w hich is closely related to the syntex is magmatism.The main gold mineralization occurred in the hydro-thermal filling metasomatic stage after blasting action.The genetic type of Shuangwang gold deposit is hidden exploding breccia type gold deposit.
Through study of metallogenic geological background and geological characteristics of Dachang gold ore
field,we consider that the gold is mainly from uppermantle and the gold mineralization is related to a thermal-dynamic event,.ie.,the Indosinian foreland marginal basin subducted northward and then collisioned obliquely with east Kunlun.As a result of ductile shearing and strong thermal-dynamic driving,a large scale tectonic deformation,hydrothermal filling and altering-mineralization become the main features.The distribution of the gold deposits and orebodies were concen trated in zone or in bunch and controlled strictly by the dextral strike-slip reverse faults.These gold deposits are formed by two diplogenetic mineralization,and the genetic type of the deposit is middle-low temperature tectonic fragmen talteration rock type gold deposit.
Yanshan region is an important component of Yan-Liao metallogenic belt located in the northern margin of
North China platform. Gold deposits are mainly distributed in the sub-fault tetonic of both sides of regional deep fault zone.The earliest initial ore source layers are Archean basement metamorphic rock series and Meso-proterozoic sedimentary cover of Changcheng and Jixian system.Magmatic activity is closely related with genesis of gold deposit,especially the acid rock in trusion of Yanshan cycle,highly abundance value and large variability coefficient prov ide necessary material condit ions for the formation of gold.
This paper briefly introduces the basic characteristics of three ore-controlling conditions of stratum, magmatic rock and structure inHuatong mining area. The Huatong deposit is a skarnized copper deposit associated with Au, Cu, Mo and Fe. It lies in the crossing of the north-west fault structure and the east-west antidline which is composed by the the stratum of Liaohe Group, and Huatong granitoid intrusive complex invade by this crossing. The orebody occurs in the contact zone between Porphyritic granite and Dashiqiao dolomitic marble. We describe the shape and scale of ore body, the alteration of surrounding rock, the ore structure, the type of skarns and the elaboration to them ineralization,and point out the prospecting direction.
We describe the geophysical technologies and methods of china’s resources exploration briefly and consider
that the integrated application of high resolution, high precision,multi-disciplinary and multi-orientation technology will become inevitable trend of geophysical development. According to the application of geophysical methods in prospecting,we divide it into three stages of metallogenic prognosis, prospecting prediction and mass screening evaluation, different tages adopt proper method. Through the experiment study on the Jingerquan copper nickel conbalt polymetallic medium ore deposit in Hami of Xinjiang and Daijiazhuang lead zinc mine in Dangchang of Gansu,we consider that the effect of geophysical exploration methods in polymetallic prospecting prediction and evaluation is obvious.
Bailing copper and zinc deposit is located in the site close to contact, the fault structure and wallrock alteration develop well, geophysical anomaly is obvious. Using high precision magnetic survey, induced current middle
gradient and sounding comprehensive exploration the copper and zine deposits in Bailing, the results show that the effects of geological prospecting are well, the geophysical anomaly of high precision magnetic survey and induced current middle gradient has important guiding significance for delineating the location and occurrence of orebodies and shortening exploration cycle.
Using the theory of uncertainty, we analyzes the main sources of the uncertainty of gold in ore sample by activated carbon enrichment and separation-iodometry and its effects on uncertainty. The component of caused uncertainty is made quantum chemistry calculation. Themethod o f evaluated and calculated the uncertainty of gold in ore sample is established by activated carbon enrichment and separation-iodometry. As a result,the standard and spread uncertainty are gained, and the measuring result should be demonstrsted with the form of uncertainty.
A new method which can directly and simultaneously determine the content of As, Sb,Bi and Hg in gold
ore samples by atomic fluorescence spectrometry in reproducing medium is introduced. It is an ideal path to improve the analysis environment, reduce the expenditure and increase the analysis accuracy. Under given conditions, the detection limits of each element are respectively: As 2.8 ng/mL, Sb 0.19 ng/mL, Bi 0.21 ng/mL, Hg 0.05 ng/mL.
Cuo’a gold deposit in Ganzi,Sichuan province, is a minirock gold mine, the elevation is between 4 200 and 4 800 m. In February, 2004, we got the exploration right and mining right,at the same time,we carried out small scale open-pit mining. According to the occurrence of the ore-body exposed in exploration engineering, we point out some assumes about development mode with combined open-pit and underground mining, and discuss studing.
The ore mixing is a necessary daily work of open-pit mine, how to mix ore affects the stability of ore grade directly. In this paper, the geographical information system (GIS) technology and the principles of linear program ming have been applied to ore mixing, the management information system of the open-pit mine(sore mixing has been developed. The system can make ore mixing plans more scientifically according to the actual situation of open-pit mine, and the ore mixing plans should be adjusted timely to ensure that the ore mixing work is flexible,easonable and scientific.
Modern information technology, especially such platform based on the computer network, is essential for
mines to obtain an increasing efficiency during the management of spare parts. The concept of workflow is introduced to the mine enterprises to deal with the frequently update of the organization and business processes of spare parts management, which has been considered as the prime reason of unsatisfied software reusability when adopting traditional development mode. According to the concept, the spare partsmanagement information system for certain mine is developed after analyzing and modeling to the workflow.
Land is thematerial basis o f ex istence and developm ent for human, land resource is an important component o f land and resources. W ith the improv ing o f science and techno logy leve,l using the advancedmethod is important for improving the efficiency of the land field work. GPS has the characteristics of high precision, quick speed,provide three-dimensional coordinates, simple operation and the global continuous coverage, it has become the important means of ga in current situation spatial data.
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